Bevel-protractor.



No. 842,205.l

QP. KELLY. I BEVEL PROTRAGTOR.

APPLICATION FILED MAY14. 1906.

, MMM.

PATENTED JAN. 29, 1907.l

f o i post.- The PATRICK KELLY, oFWoRCEsTER, MASSACHS-ETTS, ASSIGNOR oF oNEfHLF To JOHN yJ. POWER-,oF-WORCESTER, MASSACHUSETTS.

' l BEVEL-PROTRAGTOR.'

To all whom it may con/cern: H Be it known that I, PATRICK KELLY, a citii 'zen rof the United States, residing at Worcester, in the county of Worcester and Commonwealth of Massachusetts, have invented a new and useful Improvement in a Bevel- Protractor, of which the following is a speciiication,l accompanied by drawings forming a part of the same, in which- Figure 1l is a top view of my improved protractor. Fig. A:21s a side'view of the same.

Fig. 3 is a sectional viewlon line 3 3, Fig. 1. Fig. 4 is a view of my improved protractor pplied Vto the measurement of ajbevel-gear.

1g. 5 is a detached view ofthe washer for,

the center'screw-post, showing the opening y to receive the pointer. Fig. 6 isla view of a z 5, among other bevels, the inclinations or pitch' limilar reference letters and figures' refer and 2 may beset at any -desired angle, the

,l modified form of my improved protractor;

and Fig.-7 isa sectlonalpview on line 7 7 4to simlarparts in the different views.

My invention relates to an improved protractor 'which may be used' for measuring the angle of bevels, andis arranged to measure,

V of the wearing-surfaces of bevel-gears or other turned cones and it consists in the conf struction and arrangement of parts, 'as hereinafter described, and pointed out in the anf Referring'to'the accompanying drawings;

1 and 2 denote the blades of :the protractor, which are held so 'as to rotateI at 3, as will be hereinafter described.. Each of. the blades 1 and 2 is provided with a slot 4, which slot is i widened on the under side of said protractor to form a longitudinal recess 5. On one end.

of each blade 1 andv 2 is a post 6,'` which has on its lower end a blade`7, attached to the.

plosts Gare held Von the blades 1 and 2 as Io ows: Collars 8 on the osts 6 bear againstthelower side of the b ades 1 and 2. The-posts 6 areprovide'd above the collars 8 withsquare bosses 9, which are re-` 1 ceived in and held from turning -by Ithe re- Vcesses 5,` and above the bosses 9, extending .5 f 'on'the bladesLand 2.

- 4throught-he slots 4,'are screw-threaded extensions 10, fitted to receive milled nuts 11 .which .securely hold the osts 6 in position themilled nuts 11,

- are.v loosened, the osts 6 are-free Ito'move longitudinally in t 4e slots 4 of the blades 1 anl 2V and areheld from turning bythe l Specification of Letters' Patent. l application mea may 14,1906. serial No. 316,609.

,Patented Jan. 29, i907.

bosses 9, enga ed withthe recesses 5. I thus vprovide o set blades 7, which are iitted to contact with'a bevel-gear or other conethereof; as shownin Fig. y4. The blades 1 and 2 l'are attached at 3, as Jfollows: A screwon its lower end, which engages the recess 5 in the lower blade 2, thereby insuring the rotation of the blade 2 with lthe post 1 2. Loosely mounted on the post 12 is a dial 13, which isheld to rotate with the blade 1' by means of a boss 14, engaging the slot 4.

-pointer 18 moving lwith the blade 2 and :the dial 13 moving with the upper blade 1, theretween the bladesl and 2. When the desired withrelation to each other. yIf the angle to be measured is the bevelv of a cone surface, the vblades 7 may: e adjusted longitudinally on the bladesl and 2, and the blades 1 rand 2 may the cone to be measured'. By'removal of the obtain a hinged protractor which can be used.

set contacting blades are not required.` As the blades 1j and4 2 lie in diiierent planes, I have shown in Fig. 6 anattachme'nt for the u b ades in the.v same plane. To accomplish '20 by means of a milled nut 21,- engagingv a slot 4 ci' the b ade 1 and also provided with a boss 23 which flits the'recess 5. '-Upon loosening the nut 21 the blade 20 may be moved from rotary movement bythe boss .23, en-

' gaged by recess 5. The blade of the,

.be .adjusted at their pivotalconnection to Iit surfaceon an arbor and ascertain the. bevel 6o threaded pos-t 12 is provided with a head 1 2" Above the dial 13 is a washer`15, (shown in Fig-5,) provided with a radial opening 16 to l extended to form a pointer `18 on by indicating onthe 'dial 13 the angle A be-\ angle is obtained, the nut'19istigl1tened, and i 'the blades, are heldfrom further-.movement theblades 1 a d 2 to bring the'desired distance from-the .pivotal connection between?,

nuts 11, the posts 6and hence the bladesv 7 I i for measuringthe bevel of'objects'where o- 'per bladev 1, which provides measurlngthis, I attach to one end of the blade 1 ablade screw-threaded post '22, vattached \to said blade 2O,-said1post 22 extending through the '.195 longitudinally-on the blade 1, and ,it is held same thickness asthe blade2, and hencevihenl the nut 21 istightened to draw the blade 20 with a pair of pivoted blades, of means for in` dicating the angle between said blades con- 'lis ` with pifvoted blades, 'of offset bladesattached into contact with the b'l ade 1 the bladesland 20 will lievin the same plane. Y

I claim-v 1. In abeveleprotraictor, the` combination tov corres ending ends of said ivoted blades, movable ongitudinallyon sai pivoted blades but incapable of rotation with relation. thereto. 2. In a bevel-protrator, the combination sistin of a dial concentric with 'the pivot of said' lade and rotatable with one'of said blades, and a pointer rotatable vWith theI them, a

attached to the corresponding ends of said pivoted blades, said ofl'setblades being movable longitudinally on said pivoted blades but in' capable o' rotation thereon.

3. In a beYel-protraetor, lthe combination j of a pair of plvoted blades, means carried by vsaid blades forindioating the langle between air of offset blades attached and movable ongitudinallyonsaid pivotedblades but incapable of rotation thereon.

Dated this 10th day of May, 1906. 1

, PATRICK KELLY.

- Witnesses: v

' PENELOPE COMBERBAGH.

. RUFvUs B. FOWLER. 

